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With the four numbers of 0, 5, 8 and 7, we can form () different four digit numbers? (1) 10 (2) 18 (3) 11 (4) 9
This is a probability problem: 0 can't be the first place, so there are only five, eight and nine choices for a thousand, and a hundred can have three choices except for a thousand (at this time, 0 can be a hundred, and there are still two choices for four numbers except one used by a thousand), and a ten can have two choices (except for a hundred and a thousand, there are still two numbers left), so the answer is 3 * 3 * 2 * 1 = 18
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- 1. A certain organic compound A is composed of C, h and O. under certain conditions, the conversion relationship among a, B, C, D and E is as follows: it is known that the vapor density of C is 22 times higher than that of hydrogen under the same conditions, and silver mirror reaction can occur. (1) the name of the functional group in substance D is______ The structure formula of substance e is______ (2) write out the chemical equation to realize the following transformation: ① a → B______ ，②A+O 2 →C______ ③ The reaction equation of C with silver ammonia solution______ ．
- 2. In a shooting competition, the result of a country's 10 times is 92 rings, and that of B country's 7 times is 9,10,9,10,10,9,8 respectively. If B country's athlete wants to surpass that of a country, how many rings should he hit in the last 3 times?
- 3. In another shooting test, the average number of rings of a, B, C and D is the same, but the variance is 8.7, 6.5, 9.1 and 7.7 respectively Q: what is the most stable shooting result among the four A. A b b c c c d
- 4. If the average number of time spent on the way to work is 10 and the variance is 2, then the value of X-Y is 0 The process should be detailed`
- 5. The time (minutes) taken by a person on his way to work five times are x, y, 14, 12 and 13 respectively. Given that the average of this set of data is 12 and the variance is 2, then the value of | X-Y | is 0
- 6. The time (unit: minutes) that someone spends on the way to work five times are x, y, 10, 11 and 9 respectively. Given that the average of this set of data is 10 and the variance is 2, then the value of | X-Y | is () A. 1B. 2C. 3D. 4
- 7. The time (unit: minutes) that someone spends on the way to work five times are x, y, 10, 11 and 9 respectively. Given that the average of this set of data is 10 and the variance is 2, then the value of | X-Y | is () A. 1B. 2C. 3D. 4
- 8. The time Xiao Ming spent on his way to school five times is x y 10 11 9. Given that the average of this group of data is 10 minutes and the variance is 2, what is the absolute value of X-Y? A (1) B (2) C (3) d (4), please write down the whole process,
- 9. If the average of data 8, 9, 7, 8, x, 4 is 7, then the variance of this set of data is______ ．
- 10. Given a group of data 9,10,11, x, y, the average is 10, the variance is 2, find this group of data
- 11. 0-1+2-3+4-5+6-7+8-9+10-.-99+100 0.1+0.3+0.5+0.7+0.9+0.11+0.13+.+0.97+0.99
- 12. 1+2+3+4+5+6+7+8+9+0+10.23＝
- 13. What is 0 + 1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9-10
- 14. 1+1+2+3+4+5+6+7+8+9+0+10=?
- 15. The mean, median and mode all reflect a set of data______ The statistics of the model
- 16. How to find the average, median and mode of a group of data?
- 17. Average is a characteristic number of a group of data (). Median can be used to represent (). Mode can be used to represent a group of data The last one is not finished
- 18. What level does the mean median mode represent?
- 19. The mean, median and mode of a set of data will not be the same,
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